One of the reasons why I buy my games on PC instead if given the choice. Don't care if I have a 1080 or a 3090, games will work and they will look fap worthy with newer hardware.
With that being said, I do like when a console has BC. If you have a Ps5 that's BC and a Ps5 that's not BC for less money, I'd pick the Ps5 that's BC. But at the end of the day, we are buying new consoles for the new games so while it's nice to have, it's never the key reason.